High-temperature superconducting flywheel energy storage device and high-temperature superconducting flywheel energy storage device control method

Abstract

The invention relates to a high-temperature superconducting flywheel energy storage device and a control method of the high-temperature superconducting flywheel energy storage device. The problems that in the prior art, an electro-magnetic inductor motor has large standby loss, and the suspension force cannot be adjusted can be solved through the high-temperature superconducting flywheel energy storage device and the control method of the high-temperature superconducting flywheel energy storage device. The high-temperature superconducting flywheel energy storage device comprises a flywheel rotor. A stator core; a first high-temperature superconducting excitation coil; the stator iron core, the first high-temperature superconducting magnet exciting coil and the second high-temperature superconducting magnet exciting coil are arranged around a rotating shaft of the flywheel rotor in the circumferential direction of the flywheel rotor, and the first high-temperature superconducting magnet exciting coil and the second high-temperature superconducting magnet exciting coil are arranged on the two sides of the stator iron core in the extending direction of the rotating shaft respectively; the permanent magnet surrounds the rotating shaft and is arranged on one side of the flywheel rotor in the extending direction of the rotating shaft; and the control coil is arranged around the rotating shaft, and the control coil is arranged on the same side as the permanent magnet relative to the flywheel rotor.

Description

Technical Field

[0001] The present application relates to the technical field of electric energy storage, and in particular to a high-temperature superconducting flywheel energy storage device and a control method for the high-temperature superconducting flywheel energy storage device. Background Art

[0002] The induction motor, also known as the induction motor or asynchronous motor, is a motor that works based on the principle of electromagnetic induction. In order to eliminate the standby loss of the induction motor when it is running in the flywheel energy storage application, the related technology usually adopts the electrically excited induction motor, which is a special type of motor that combines the characteristics of the induction motor and the electric excitation technology. The electrically excited induction motor in the related technology generally provides a working magnetic field and a suspension force for the flywheel rotor through a permanent magnet ring. However, the electrically excited induction motor in the related technology cannot demagnetize the magnetic flux in the standby state, resulting in a large standby loss. In addition, the permanent magnet ring cannot adjust the suspension force, so it cannot respond to changes in the axial load. Summary of the invention

[0003] Based on this, it is necessary to provide a high-temperature superconducting flywheel energy storage device and a control method for a high-temperature superconducting flywheel energy storage device to address the problems of large standby losses and inability to adjust the suspension force of the electrically excited induction motor in the related technology.

[0004] According to one aspect of the present application, the present application provides a high-temperature superconducting flywheel energy storage device, the high-temperature superconducting flywheel energy storage device comprising:

[0005] Flywheel rotor;

[0006] stator core;

[0007] The first high temperature superconducting excitation coil;

[0008] a second high-temperature superconducting excitation coil, wherein the stator core, the first high-temperature superconducting excitation coil and the second high-temperature superconducting excitation coil are disposed around the rotating shaft of the flywheel rotor along the circumferential direction of the flywheel rotor, and the first high-temperature superconducting excitation coil and the second high-temperature superconducting excitation coil are respectively disposed on both sides of the stator core along the extending direction of the rotating shaft;

[0009] A permanent magnet, which is disposed around the rotating shaft and along the extending direction of the rotating shaft on one side of the flywheel rotor;

[0010] A control coil is arranged around the rotating shaft and is arranged on the same side of the flywheel rotor as the permanent magnet.

[0011] The above-mentioned high-temperature superconducting flywheel energy storage device adopts two sets of independent first high-temperature superconducting excitation coils and second high-temperature superconducting excitation coils to provide the main magnetic flux, so that it is possible to transmit a very large current with almost zero resistance, thereby reducing the excitation loss and improving the energy density of the high-temperature superconducting flywheel energy storage device; when the high-temperature superconducting flywheel energy storage device is on standby, the excitation current of the first high-temperature superconducting excitation coil and the second high-temperature superconducting excitation coil can be reduced to zero, thereby achieving demagnetization of the main magnetic flux and effectively suppressing the standby loss of the high-temperature superconducting flywheel energy storage device; in addition, the above-mentioned high-temperature superconducting flywheel energy storage device is arranged on the same side as the permanent magnet relative to the flywheel rotor through the control coil, so that an adjustment magnetic flux can be generated in the high-temperature superconducting flywheel energy storage device to adjust the axial suspension force of the flywheel rotor in combination with the permanent magnet.

[0012] In one embodiment, the high-temperature superconducting flywheel energy storage device includes a casing and a bearing seat, the casing has a cavity, the flywheel rotor is arranged in the cavity, the bearing seat is arranged on one side of the casing along the extension direction of the rotating shaft, the bearing seat has a mounting groove, and the control coil is arranged in the mounting groove.

[0013] In one embodiment, the high temperature superconducting flywheel energy storage device includes a cadmium magnetic mechanism, and the cadmium magnetic mechanism is sandwiched between the bearing seat and the casing along the circumference of the bearing seat around the rotating shaft.

[0014] In one embodiment, the cadmium magnetic mechanism includes a first cadmium magnetic structure and a second cadmium magnetic structure that are connected to each other, the first cadmium magnetic structure is clamped between the bearing seat and the housing along the radial direction of the bearing seat, and the second cadmium magnetic structure is clamped between the bearing seat and the housing along the extension direction of the rotating shaft.

[0015] In one of the embodiments, the bearing seat is provided with an abutting flange along its circumference, and the abutting flange is pressed against the second cadmium magnetic structure along the rotation axis direction.

[0016] In one of the embodiments, the cadmium magnetic mechanism is made of non-ferromagnetic material.

[0017] In one embodiment, the flywheel rotor includes a first flywheel mechanism, a second flywheel mechanism and a rotor mechanism, and the first flywheel mechanism and the second flywheel mechanism are respectively connected to two sides of the rotor mechanism along the extension direction of the rotating shaft.

[0018] In one embodiment, the first flywheel mechanism, the second flywheel mechanism and the rotor mechanism are integrally formed.

[0019] In one embodiment, the number of turns of the first high-temperature superconducting excitation coil and the number of turns of the second high-temperature superconducting excitation coil are equal.

[0020] According to another aspect of the present application, the present application provides a high-temperature superconducting flywheel energy storage device control method, which is applied to the above-mentioned high-temperature superconducting flywheel energy storage device, and the high-temperature superconducting flywheel energy storage device control method includes:

[0021] When the high-temperature superconducting flywheel energy storage device is in a charging and discharging operation state, currents with opposite flows are respectively supplied to the first high-temperature superconducting excitation coil and the second high-temperature superconducting excitation coil, and the current magnitude of the control coil is adjusted in real time, so that the flywheel rotor is in a balanced rotation state;

[0022] When the high-temperature superconducting flywheel energy storage device is in a standby operation state and the flywheel rotor is stable in the balanced rotation state, stopping the current from flowing to the first high-temperature superconducting excitation coil, the second high-temperature superconducting excitation coil and the control coil;

[0023] When the high-temperature superconducting flywheel energy storage device is in a standby operation state and when the high-temperature superconducting flywheel energy storage device is in an unbalanced rotation state, current is simultaneously passed through the first high-temperature superconducting excitation coil, the second high-temperature superconducting excitation coil and the control coil to adjust the flywheel rotor to restore the balanced rotation state.

[0024] The above-mentioned control method of the high-temperature superconducting flywheel energy storage device adopts two sets of independent first high-temperature superconducting excitation coils and second high-temperature superconducting excitation coils to provide the main magnetic flux, so that it is possible to transmit a very large current with almost zero resistance, thereby reducing the excitation loss and improving the energy density of the high-temperature superconducting flywheel energy storage device; when the high-temperature superconducting flywheel energy storage device is in a standby operation state and the flywheel rotor is stable in a balanced rotation state, the current is stopped from being passed to the first high-temperature superconducting excitation coil, the second high-temperature superconducting excitation coil and the control coil, so that the excitation current of the first high-temperature superconducting excitation coil and the second high-temperature superconducting excitation coil can be reduced to zero, thereby achieving demagnetization of the main magnetic flux and effectively suppressing the standby loss of the high-temperature superconducting flywheel energy storage device; in addition, when the high-temperature superconducting flywheel energy storage device is in a standby operation state and when the high-temperature superconducting flywheel energy storage device is in an unbalanced rotation state, current is passed to the first high-temperature superconducting excitation coil, the second high-temperature superconducting excitation coil and the control coil at the same time, so that the axial suspension force of the flywheel rotor can be adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a cross-sectional view of a high-temperature superconducting flywheel energy storage device in one embodiment of the present application.

[0026] Figure 2 for Figure 1 A schematic diagram of the magnetic flux path of a high-temperature superconducting flywheel energy storage device in another embodiment.

[0027] Figure 3 Schematic diagram of the structure of the flywheel rotor of the high-temperature superconducting flywheel energy storage device in one embodiment of the present application.

[0028] Figure 4 This is a flow chart of a control method for a high-temperature superconducting flywheel energy storage device in one embodiment of the present application.

[0029] Description of Figure Numbers

[0030] 1. High-temperature superconducting flywheel energy storage device; 10. Flywheel rotor; 11. First flywheel mechanism; 12. Second flywheel mechanism; 13. Rotor mechanism; 10a. Rotating shaft; 20. Stator core; 30. First high-temperature superconducting excitation coil; 40. Second high-temperature superconducting excitation coil; 50. Permanent magnet; 60. Control coil; 70. Casing; 70a. Cavity; 80. Bearing seat; 81. Abutment flange; 80a. Mounting groove; 90. Cadmium magnetic mechanism; 91. First cadmium magnetic structure; 92. Second cadmium magnetic structure. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0032] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0033] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0035] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0037] Considering that the existing electromagnetic induction motor generally provides a working magnetic field and a suspension force for the flywheel rotor through a permanent magnet ring, and the electromagnetic induction motor cannot demagnetize the magnetic flux in the standby state, resulting in a large standby loss. In addition, the permanent magnet ring cannot adjust the suspension force, so it cannot respond to changes in the axial load. The present application provides a high-temperature superconducting flywheel energy storage device 1 and a control method for a high-temperature superconducting flywheel energy storage device, which can not only effectively reduce the standby loss, but also adjust the suspension force, which is convenient for application and promotion.

[0038] Specifically, please refer to Figure 1One embodiment of the present application provides a high-temperature superconducting flywheel energy storage device 1, which may include a flywheel rotor 10, a stator core 20, a first high-temperature superconducting excitation coil 30, a second high-temperature superconducting excitation coil 40, a permanent magnet 50 and a control coil 60. The stator core 20, the first high-temperature superconducting excitation coil 30 and the second high-temperature superconducting excitation coil 40 are arranged around the rotating shaft 10a along the circumference of the flywheel rotor 10, and the first high-temperature superconducting excitation coil 30 and the second high-temperature superconducting excitation coil 40 are respectively arranged on both sides of the stator core 20 along the extension direction of the rotating shaft 10a. The permanent magnet 50 is arranged on one side of the flywheel rotor 10 around the rotating shaft 10a and along the extension direction of the rotating shaft 10a. The control coil 60 is arranged around the rotating shaft 10a, and the control coil 60 is arranged on the same side as the permanent magnet 50 relative to the flywheel rotor 10.

[0039] The above-mentioned high-temperature superconducting flywheel energy storage device 1 adopts two sets of independent first high-temperature superconducting excitation coils 30 and second high-temperature superconducting excitation coils 40 to provide the main magnetic flux, so that it can achieve the transmission of extremely large current with almost zero resistance, thereby reducing the excitation loss and improving the energy density of the high-temperature superconducting flywheel energy storage device 1. When the high-temperature superconducting flywheel energy storage device 1 is on standby, the excitation current of the first high-temperature superconducting excitation coil 30 and the second high-temperature superconducting excitation coil 40 can be reduced to zero, so that the demagnetization of the main magnetic flux is achieved, and the standby loss of the high-temperature superconducting flywheel energy storage device 1 is effectively suppressed. In addition, the above-mentioned high-temperature superconducting flywheel energy storage device 1 is arranged on the same side as the permanent magnet 50 relative to the flywheel rotor 10 by setting the control coil 60 in the high-temperature superconducting flywheel energy storage device 1 so that the control coil can generate an adjustment magnetic flux in the high-temperature superconducting flywheel energy storage device 1, so as to adjust the axial suspension force of the flywheel rotor 10 in combination with the permanent magnet 50.

[0040] It should be noted that in conventional induction motors, ordinary excitation coils are generally used to generate a working magnetic field, so the excitation copper loss generated during charging and discharging operation will greatly reduce the operating efficiency. However, the present application uses a first high-temperature superconducting excitation coil 30 and a second high-temperature superconducting excitation coil 40, so that a very large current can be transmitted with almost zero resistance, and the magnetic flux generated by the first high-temperature superconducting excitation coil 30 and the second high-temperature superconducting excitation coil 40 is used as the main magnetic flux, thereby reducing the excitation loss and improving the energy density of the high-temperature superconducting flywheel energy storage device 1.

[0041] In addition, combined Figure 2As shown, the following is an explanation of the process of adjusting the axial suspension force of the flywheel rotor 10. When the flywheel rotor 10 is in an axial equilibrium position, only the vertically upward magnetic pulling force generated by the permanent magnet 50 is used to offset the gravity of the flywheel rotor 10. At this time, the current in the control coil 60 is 0, and no additional loss is generated. When the flywheel rotor 10 is offset in the axial direction, an adjustment current can be passed through the first high-temperature superconducting excitation coil 30, the permanent magnet 50 and the control coil 60, so that the vertically upward resultant force F1 generated by the first high-temperature superconducting excitation coil 30, the permanent magnet 50 and the control coil 60 can offset the vertically downward resultant force F2 generated by the second high-temperature superconducting excitation coil 40 and gravity, and the flywheel rotor 10 returns to the equilibrium position.

[0042] Optionally, the number of turns of the first high-temperature superconducting excitation coil 30 and the second high-temperature superconducting excitation coil 40 are equal, so that the magnetic field effects generated by the first high-temperature superconducting excitation coil 30 and the second high-temperature superconducting excitation coil 40 are consistent. Then, in actual work, when the flywheel rotor 10 is offset in the axial direction, there is no need to adjust the current of the first high-temperature superconducting excitation coil 30 and the second high-temperature superconducting excitation coil 40. The axial position of the flywheel rotor 10 can be adjusted by adjusting the current flow of the control coil 60. This eliminates the influence on the main magnetic flux of the first high-temperature superconducting excitation coil 30 and the second high-temperature superconducting excitation coil 40, thereby improving the simplicity of adjustment.

[0043] Optionally, combined Figure 1 As shown, the high-temperature superconducting flywheel energy storage device 1 includes a housing 70 and a bearing seat 80, the housing 70 has a cavity 70a, the flywheel rotor 10 is arranged in the cavity 70a, the bearing seat 80 is arranged on one side of the housing 70 along the extension direction of the rotating shaft 10a, the bearing seat 80 is provided with a mounting groove 80a, and the control coil 60 is arranged in the mounting groove 80a, so that the control coil 60 can generate an adjustment force on the flywheel rotor 10 along the extension direction of the rotating shaft 10a, so as to achieve the axial position adjustment of the flywheel rotor 10. Specifically, the mounting groove 80a can be implemented as an annular groove around the rotating shaft 10a. The adjustment coil can be clamped in the aforementioned annular groove around the rotating shaft 10a.

[0044] Optionally, combined Figure 1 and Figure 2 As shown, the high-temperature superconducting flywheel energy storage device 1 may include a cadmium magnetic mechanism 90, which is clamped between the bearing seat 80 and the casing 70 along the circumferential direction of the bearing seat 80 around the rotating shaft 10a. In this way, the barrier effect between the main magnetic flux generated by the first high-temperature superconducting excitation coil 30 and the second high-temperature superconducting excitation coil 40 and the regulating magnetic flux generated by the control coil 60 can be improved, so as to reduce the influence of the regulating magnetic flux generated by the control coil 60 on the main magnetic flux, so as to ensure the working reliability of the high-temperature superconducting flywheel energy storage device 1.

[0045] It is understandable that the cadmium magnetic mechanism 90 is made of non-ferromagnetic material to ensure the barrier effect between the two magnetic fluxes. Optionally, the cadmium magnetic mechanism 90 can be made of, but not limited to, iron-nickel alloy, cobalt-based amorphous material and other materials.

[0046] Optionally, continue to Figure 1 and Figure 2 The cadmium magnetic mechanism 90 includes a first cadmium magnetic structure 91 and a second cadmium magnetic structure 92 that are connected to each other. The first cadmium magnetic structure 91 is clamped between the bearing seat 80 and the housing 70 along the radial direction of the bearing seat 80, and the second cadmium magnetic structure 92 is clamped between the bearing seat 80 and the housing 70 along the extension direction of the rotating shaft 10a. In this way, the mutual isolation between the main magnetic flux and the regulating magnetic flux can be achieved both in the radial direction and in the axial direction.

[0047] Specifically, the cadmium magnetic mechanism 90 includes a first cadmium magnetic structure 91 and a second cadmium magnetic structure 92 that are connected to each other, so that when the cadmium magnetic mechanism 90 is installed, it is only necessary to first sleeve the first cadmium magnetic structure 91 and the second cadmium magnetic structure 92 on the upper edge of the casing 70. Specifically, the first cadmium magnetic structure 91 abuts against the side surface of the upper edge of the casing, and the second cadmium magnetic structure 92 abuts against the upper surface of the upper edge of the casing; then, the bearing seat 80 is sleeved along the extension direction of the rotating shaft 10a to press the cadmium magnetic mechanism 90 against the upper edge of the casing 70. This helps to improve the convenience of assembly and the stability of structural installation.

[0048] Optionally, the bearing seat 80 is provided with an abutting flange 81 along its circumference, and the abutting flange 81 presses against the second cadmium magnetic structure 92 along the direction of the rotating shaft 10 a to achieve tight installation of the cadmium magnetic structure 90 .

[0049] Optionally, combined Figure 3 As shown, the flywheel rotor 10 may include a first flywheel mechanism 11, a second flywheel mechanism 12 and a rotor mechanism 13. The first flywheel mechanism 11 and the second flywheel mechanism 12 are respectively connected to both sides of the rotor mechanism 13 along the extension direction of the rotating shaft 10a, so that the first flywheel mechanism 11 and the second flywheel mechanism 12 can be driven to rotate under the rotation of the rotor mechanism 13 to realize the mechanical energy conversion between electrical energy and the first flywheel mechanism 11 and the second flywheel mechanism 12.

[0050] Optionally, the first flywheel mechanism 11, the second flywheel mechanism 12 and the rotor mechanism 13 are integrally formed, which helps to improve the structural integrity and reduce the volume of the device.

[0051] Combination Figure 4 As shown, according to another aspect of the present application, the present application also provides a high-temperature superconducting flywheel energy storage device control method, which is applied to the above-mentioned high-temperature superconducting flywheel energy storage device 1, and the high-temperature superconducting flywheel energy storage device control method includes:

[0052] Combination Figure 2 As shown, when the high-temperature superconducting flywheel energy storage device 1 is in the charge and discharge operation state, currents with opposite directions are respectively passed through the first high-temperature superconducting excitation coil 30 and the second high-temperature superconducting excitation coil 40, so that magnetic flux paths with opposite directions can be generated, and then the magnetic density of the upper air gap can be enhanced and the magnetic density of the lower air gap can be suppressed. In this way, while the first high-temperature superconducting excitation coil 30 and the second high-temperature superconducting excitation coil 40 provide a working magnetic field, the magnetic suspension effect on the flywheel rotor 10 is realized, and the rotational friction of the flywheel rotor 10 is reduced. At the same time, the current size of the control coil 60 can be adjusted in real time to make the flywheel rotor 10 in a balanced rotation state, so that the position adjustment of the flywheel rotor 10 along the axial direction is realized.

[0053] When the high-temperature superconducting flywheel energy storage device 1 is in a standby operation state and the flywheel rotor 10 is stable in a balanced rotation state, the current can be stopped from flowing to the first high-temperature superconducting excitation coil 30, the second high-temperature superconducting excitation coil 40 and the control coil 60, thereby achieving demagnetization of the main magnetic flux, and effectively suppressing the standby loss of the high-temperature superconducting flywheel energy storage device 1;

[0054] When the high-temperature superconducting flywheel energy storage device 1 is in a standby operation state and when the high-temperature superconducting flywheel energy storage device 1 is in an unbalanced rotation state, current is simultaneously passed through the first high-temperature superconducting excitation coil 30, the second high-temperature superconducting excitation coil 40 and the control coil 60 to adjust the flywheel rotor 10 to restore the balanced rotation state. It can be understood that when the flywheel rotor 10 is in an axially balanced position, only the vertically upward magnetic pulling force generated by the permanent magnet 50 is used to offset the gravity of the flywheel rotor 10. At this time, the current in the control coil 60 is 0, and no additional loss is generated.

[0055] The above-mentioned high-temperature superconducting flywheel energy storage device control method adopts two sets of independent first high-temperature superconducting excitation coils 30 and second high-temperature superconducting excitation coils 40 to provide the main magnetic flux, so that a very large current can be transmitted with almost zero resistance, thereby reducing the excitation loss and improving the energy density of the high-temperature superconducting flywheel energy storage device 1; when the high-temperature superconducting flywheel energy storage device 1 is in the standby operation state and the flywheel rotor 10 is stable in a balanced rotation state, the first high-temperature superconducting excitation coil 30, the second high-temperature superconducting excitation coil 40 and the control coil 60 are stopped from being energized. Flow, so that the excitation current of the first high-temperature superconducting excitation coil 30 and the second high-temperature superconducting excitation coil 40 can be reduced to zero, thereby achieving demagnetization of the main magnetic flux, and effectively suppressing the standby loss of the high-temperature superconducting flywheel energy storage device 1; in addition, when the high-temperature superconducting flywheel energy storage device 1 is in the standby operation state and when the high-temperature superconducting flywheel energy storage device 1 is in the unbalanced rotation state, current is simultaneously passed through the first high-temperature superconducting excitation coil 30, the second high-temperature superconducting excitation coil 40 and the control coil 60, so that the axial suspension force of the flywheel rotor 10 can be adjusted.

[0056] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A high temperature superconducting flywheel energy storage device, characterized in that: The high temperature superconducting flywheel energy storage device comprises: Flywheel rotor; stator core; The first high temperature superconducting excitation coil; a second high-temperature superconducting excitation coil, wherein the stator core, the first high-temperature superconducting excitation coil and the second high-temperature superconducting excitation coil are disposed around the rotating shaft of the flywheel rotor along the circumferential direction of the flywheel rotor, and the first high-temperature superconducting excitation coil and the second high-temperature superconducting excitation coil are respectively disposed on both sides of the stator core along the extending direction of the rotating shaft; A permanent magnet, which is disposed around the rotating shaft and along the extending direction of the rotating shaft on one side of the flywheel rotor; A control coil is arranged around the rotating shaft and is arranged on the same side of the flywheel rotor as the permanent magnet.

2. The high temperature superconducting flywheel energy storage device according to claim 1, characterized in that: The high-temperature superconducting flywheel energy storage device includes a casing and a bearing seat, the casing has a cavity, the flywheel rotor is arranged in the cavity, the bearing seat is arranged on one side of the casing along the extension direction of the rotating shaft, the bearing seat is provided with a mounting groove, and the control coil is arranged in the mounting groove.

3. The high temperature superconducting flywheel energy storage device according to claim 2, characterized in that: The high-temperature superconducting flywheel energy storage device comprises a cadmium magnetic mechanism, and the cadmium magnetic mechanism is sandwiched between the bearing seat and the casing along the circumference of the bearing seat around the rotating shaft.

4. The high temperature superconducting flywheel energy storage device according to claim 3, characterized in that: The cadmium magnetic mechanism includes a first cadmium magnetic structure and a second cadmium magnetic structure connected to each other. The first cadmium magnetic structure is clamped between the bearing seat and the housing along the radial direction of the bearing seat, and the second cadmium magnetic structure is clamped between the bearing seat and the housing along the extension direction of the rotating shaft.

5. The high temperature superconducting flywheel energy storage device according to claim 4, characterized in that: The bearing seat is provided with an abutting flange along its circumference, and the abutting flange is pressed against the second cadmium magnetic structure along the rotation axis direction.

6. The high temperature superconducting flywheel energy storage device according to any one of claims 3 to 5, characterized in that: The cadmium magnetic mechanism adopts non-ferromagnetic material.

7. The high temperature superconducting flywheel energy storage device according to claim 1, characterized in that: The flywheel rotor comprises a first flywheel mechanism, a second flywheel mechanism and a rotor mechanism, wherein the first flywheel mechanism and the second flywheel mechanism are respectively connected to two sides of the rotor mechanism along the extension direction of the rotating shaft.

8. The high temperature superconducting flywheel energy storage device according to claim 7, characterized in that: The first flywheel mechanism, the second flywheel mechanism and the rotor mechanism are integrally formed.

9. The high temperature superconducting flywheel energy storage device according to claim 1, characterized in that: The number of turns of the first high-temperature superconducting excitation coil is equal to that of the second high-temperature superconducting excitation coil.

10. A control method for a high-temperature superconducting flywheel energy storage device, applied to the high-temperature superconducting flywheel energy storage device according to any one of claims 1 to 9, characterized in that: The high temperature superconducting flywheel energy storage device control method comprises: When the high-temperature superconducting flywheel energy storage device is in a charging and discharging operation state, currents with opposite flows are respectively supplied to the first high-temperature superconducting excitation coil and the second high-temperature superconducting excitation coil, and the current magnitude of the control coil is adjusted in real time, so that the flywheel rotor is in a balanced rotation state; When the high-temperature superconducting flywheel energy storage device is in a standby operation state and the flywheel rotor is stable in the balanced rotation state, stopping the current from flowing to the first high-temperature superconducting excitation coil, the second high-temperature superconducting excitation coil and the control coil; When the high-temperature superconducting flywheel energy storage device is in a standby operation state and when the high-temperature superconducting flywheel energy storage device is in an unbalanced rotation state, current is simultaneously passed through the first high-temperature superconducting excitation coil, the second high-temperature superconducting excitation coil and the control coil to adjust the flywheel rotor to restore the balanced rotation state.

Images